$D7/215: Screen value of current Input Character/Last Character Output
Kernal-Reference:
ASL $D7 : $E642
BIT $D7 : $E644
CPX $D7 : $F9E4
EOR $D7 : $FC45
LDA $D7 : $E67A $E723 $FC39
LSR $D7 : $FA04
STA $D7 : $E63E $E674 $E717 $FC47
STX $D7 : $F9AA $FC20
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